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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de678ad4b3fc28a1f74608bf8852e25926f5bedd84919e05cd36b46d29490661' 
  AND token = 'W1/LS2DizT0+iRjm0tGCNFyVzi+Zp+ni8GI9Pnifj8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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