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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9edd8cce1b1dbd8a1c4d83fc24a86e5030c4807839aa13f9f686309171bd7a9' 
  AND token = 't1/SbmerIjb9o/OhS3gBMzTiSzD8rQ//wLqAYrqL86w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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