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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa785b243c674210424a88341dea77c6a47ce253459a0112c96d7be9bf7ab6dd' 
  AND token = '+oubd8SH4D+ISgvzrpxP4D1/HHxStJJI+j4XHl6k1+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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