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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411e2f819e41b2e814f85fc3a12b45a6e212e2618aa6765d3cd65d215716f276' 
  AND token = 'qNzpCr1+dPEcH0Xcc8ODpfJvwalB8kpIS/PzI7CYwMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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