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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6aab06332ab1ddff38b91f99376f8ed4e3692920e6395a384792d4199d980d3' 
  AND token = 'ay1SHi4/OJ1Ex3hOwTpGGbmkgX8RglaTyO/R5aBfKko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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