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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e89bec6de4e81235d1caf90244d95a70181b3d06799a00737258c8e29d0895' 
  AND token = 'cV1/9vHowHNmxaJrme3QsmVJ36MVa8I9Jk2PD16colE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00361

JSON explain

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