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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f80c3594fe5110df640a89d8e492a03746a3708f6e795b2c8cf58852dd0fae' 
  AND token = '5jchDV2qqAFyIegb+uyB0m4vF1oEE8QIriB3v32QTIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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