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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a83df16b787ebd09edabe1c593081cbf8dbbeab5616962ec3b3ba8d26e75c0' 
  AND token = 'fj67mu25wWpVQyH7jbcQ7/l6wTYCp2FAbEHwoC1Bz30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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