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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b255b2ddb26b9c4d0287bc1ab20b6d55f2f43bd7292e8395edd70bf85ebff5' 
  AND token = '9RTY5eoS7I2KDziKHLPvVc+8ZapTamUYDmVqTKyRsXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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