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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68eb0b64cccee8c14bcc83c42d787498f64d31c59970361fc3aa1a1b147028de' 
  AND token = '7MPjwLasFNbfkCH1CmXnHJQrynN3ruIJW790hioyJ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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