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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b23a8d0f568328645452e38310887ab6636abb53b59826379d22a33f6275101' 
  AND token = 'b7YH+t/R+rpqB/gtpxh41/jINymjaVqtNbwPafSx9E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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