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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162984afbe8d0ca1d369ec11022bcbcd9afef4d3218a2d5bab9ba3329553ebbe' 
  AND token = '2Pgz3HQ5fYDtHUab2twB2R8UxGf4q8HasSDgCHQPlq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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