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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27839fe4ce93256cb74b80834f40edbf2546d0acefc956bb743672a6fd7e1dd' 
  AND token = 'LH27nMBO4hYv9kPaHUHX9d2R/Rtadkn05pqU9ZCmUNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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