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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3436272fb93354a7803307b674812954e66cd5a6f123c01816782163f3baf7e9' 
  AND token = 'v2uEJ+y5O5/kyHQtF50ebOyoXT/8aPC7jZpK4ZRNWvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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