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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161a40a8fd1f8e1ac90c1119c4c6acdc95107675ddc86432266b590793a32860' 
  AND token = 'itSUAA2VcrkkBkMCML5GSCevhr7G9Ana3Il5PwgvK+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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