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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e5d3e1a694106a9969e7d4bea87c89eebeb8cd85dd5568fc5b1fadb719217' 
  AND token = 'OETkOmCSSs1xl4Uifvuq9YvH8OrfrQZF+Tc/lQtSEuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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