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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31a5424c5b289dc66b8a84d807f8b12972d77803f3650026e3f8e15c3d267c1' 
  AND token = 't3mia3EH2iWEjnWmz4/sujUv1hLR/pD5u5CNph3GlU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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