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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a765e56ab4fc39946725f5acfd9c7c2a91f2d06f84ae9b4464c8500047d6c300' 
  AND token = 'GddPv1ymq5uhx5xjM1ClLPSd05E3XIn4C5jwjbmP5FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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