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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c929fa93a7144ae5d137f5e4ea816e999d091743469bf075d75fe3eb3cc8784' 
  AND token = 'l9FlzTlzJ1V0LCG4fw5wg1FhplRc3MwADIAx6vXinGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}