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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaa618f2cbbfecad22f3f0bde3415d4ebc2b1224f25f2eca9f6b8ee6ec485bc' 
  AND token = 'gS59o6JbIqk6Afroe5waag7seHhTKphEAKDosw/E5FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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