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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a30e18705a2fe7db2e76ac0c2b6edc5b9a29e21c40997a1d68ec0bc41c831e' 
  AND token = '+QK30zGGlCcZZEhjnZtqZFl8Yssbzf9628/U0/FWSgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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