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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fdc684875dfe2e951935831f280a8c7cbb000332525ce713d012d82bd959f4' 
  AND token = 'f/sVn7BO43CF4WUVQ2GkQ6J19e8b0udtXIFMOARKPY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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