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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2a89cf9a0d5458382b90571dfa2c2dafc695c72545e76436456f6b9d00cedf' 
  AND token = '9+XHa8YsfZo/1SvbwOYb0R3380jrpiOf7HlcVtFt6w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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