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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038707d9272d8d985168c87f43bd3b749a9c316416d8039a8619b6be52a45315' 
  AND token = 'KBqZAcc5Qz9ANFrWUOosUDzg9F5uqGR0uSfqltKLHHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00593

JSON explain

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