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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7c18507c0d55d063678c99e0a802ca878acaa7bf16adcf47b21b60eb1ccb5e' 
  AND token = 'U83Fmm3out3ILm1L8PJFZdi4+yghNMaysN4Y0yHwBWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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