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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f99f64230f56f233d7892aaf06a8b3dbc8ecfd2b2d9026d8d010b3eae3d8a8' 
  AND token = 'tQKRu+mJ/wabDeiaBixzmQGcuoBu7XRysuAyxFTyhTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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