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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd641d8d08dc91194b7693b85ee401a2dd84a9e8dc4cac035923e16b22ba8a32d' 
  AND token = 'jiHdg0Q3DnbciSvUFFLcg9RTRp31bqLFAbOFmJE43E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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