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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099bc325b755df6620e2397dfa5d37b288924f7664693242b8f649c87aeb5746' 
  AND token = 'sLlAkW7h9HC3cF7cLS1MNvrq6Ng3OGxJpaqFDsNRm5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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