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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a12187adc8f9f91c42687f566ac0bae4a00bf03bb7bf92f9cfa905ac497842a' 
  AND token = '1wt6+ZwDRRiyhpeWwzDF/j56CRLERi85kXbKHec72kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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