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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca346f51b44ee780c7152fa8cc84f92cd9db505063d056bfffaf087614e8f8d' 
  AND token = 'gef+J7auSsikxqtl9J3r4jX85UJfHWiXSrciwFEMINE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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