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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2503c8b260781e2b09b0406292a50a3a2ced549d24bd2c6318c880b413331922' 
  AND token = '8gJ/uMcNEf7kgRC5qGQv9MF2Ytwv51rxnIJ8NYgjhlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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