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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a504393c3e128e13d1bf7184ea44f305a422bf48c8564fafed6e66d48c249960' 
  AND token = 'FQVXwMseq6GMzDIvbISA9A3VIeCsNJOCgmaMsz7ZC0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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