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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57de5d619a5b4c284e6817cc2378564d4c847c2bc290371ea0510a341981802b' 
  AND token = 'gd9DHGA7cCCP9wS34JUQS9osmLdcB/nZw4+SgURQJfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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