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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ec9500d9804997df6cd280e306ae1c31a25523b9dd0527c8db5d18948bf914' 
  AND token = 'taXsoErFAmjqV1tc5sXjkcevhn8QPpribyE3pB/C+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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