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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a488e238adbb2b60d22922e5ad830d69d2ff81db8c7f897512768a073dc4d3d8' 
  AND token = 'jgcf9CzYv5WO8rRiL0ESVX/+t1JMSHxl43/3yuBHat0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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