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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309c4126f2abd93d6da00b117b1741bc28e70cfcfcccfafb3aff6bd400ba8d2a' 
  AND token = 'oz/4XPHg6xxY70P9XRBBYRjyNKzO5BanpWYyo/KCJ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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