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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51913e3dd77d95d71cf3da0781c5a21ae4affbb78628acea78863cda3f25786' 
  AND token = '9VR12SQnDpNxaP83RRCJ4TuNQF/N3wSFaImLYfCcgiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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