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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0910f0a342f04a957dd9a90f929903bd092796f8533d4eacf40e56a594dcb5b7' 
  AND token = 'rcFI4bE+LYMqZeiJpDxjXO4pd+rpTIg0so+026GP1dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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