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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67723f54271e3585916a100536a69c4eca2923a5df81d59c5c516ec3de3a13b' 
  AND token = 'w06OKA9Edr069tcpb4eHC2ykrIKeApSz7EdYQl2ZgYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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