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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5683e4e7507de2660af9d3ce275ef719468b10f72b6b08fc87369789c1900862' 
  AND token = '50cQW3kWCrKAUyCY6hnPVORRrhvKlFa4FiMf274XT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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