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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71f7793540b6f5fa4b36640d8b9eb144bdb5b6a3b10d0f9d9f1c0be711852f' 
  AND token = 'tbKHs6C+H/S8jP4+KSnE5Mk5ORV3ybrcfEtIl48BG4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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