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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac42d00a25c11c7a16b656a2837460ae8dcbe178108f0d9050148d69482ea155' 
  AND token = 'ClVP1+806OTf0HWcyH2X0vcSGtZtAeFcx5tEuWVzz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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