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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7c058481d6c9a2b27e8a5d46672e73c797ac703eb1e56ce9b92bfdfcb97953' 
  AND token = 'Nz8aAVKddiRMtaxhWU6p5J0wAw3EZ5+D/Mz4OyGmZHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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