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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974a0531d707c5413738cb8a0d5634c37fe85aa21993f1f32db2103b51c8e332' 
  AND token = 'Ep5yDT4YKuxBDxEQJXNN6m89cfneBvFsSa/l9XH/Fkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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