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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f298fe446d9359e36b10b17ab0083b9593134bc4e539569bbf44b7229cdb590b' 
  AND token = 'mPZOYO7o9PNLukqwaPgOEi6ZC3AlHSel/HAQZOPr2w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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