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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147f8a1540bdde7734f49ec9bbfb7e31fa0cdd5e81199203b418a3fb679ca6a4' 
  AND token = '+lvxZir/7edz3nl8tO+XP4yugz05LlPiR7zh6ep04lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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