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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d6c99c8301735d95b887f655f98b364390ac4c72ff6f72181c8f316bec7d28' 
  AND token = 'fAPvDQp1+0+FGs7lbga855RGRw5XSwWDISinMuIluRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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