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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed6eb6e72c2066b8dc01d4e2234107e0459535a5d5f510dc12da9f42c983461' 
  AND token = 'v09WBwxVKhgL0o48jg2dCR4LnpWiv1zvdZb+n/EQ71c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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