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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca38b4c50f8ba773880b65151823e55c9bb749fc3dea1be51d191f096e0fc1f8' 
  AND token = 'g3bQxo0iIB7fzt62B6mVqgT+Dqm7C1qEmudmif5y1B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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