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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87aebae3119949699f9d038b4a7dc75655abd6604eeaa2ca5a8c4e837067133' 
  AND token = 'U7CV02NYCWhaX5ubUz0y6hIeoREa5luFVQI/lbvc3eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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