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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27c585e666c8c30a1d053c4ca9dd7cc8dcd29168d501a5bf2a7fd4594bb4163' 
  AND token = 'PP1CrtP+i9xciIab/0FLsaBpMbPhVYx3XVbH41TW2dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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