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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2974728cb8f0d36d780268a92fe5e65ce723fded8dd6239b7ecdd6ab1aee10d' 
  AND token = 'uccZrFgCWXuVVK1WWe3KoSii3X4zxXiP+yMhYaKMLVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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