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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f95a676ab4d33cca4c3adf3720989181825f42cb0721986da0a62b48f8c3de' 
  AND token = '03kK5jD9WoRH/PvX/gTszUuEuUE4lw18GDDT4iNp8Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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