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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e524fdb32e6a59b50d5e4103c18f830f9b62804509a127f8054b4bed3b4c4aa3' 
  AND token = 'Sf86bNBvOCmndSl7v5yl5EUEWofQ7u04NWoKbAi9CyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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