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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be81d7cdd2bb4bf3e33931292e0403432358c1b98b355ced5ed9468bc4e8bd57' 
  AND token = 'KQM0jQJdMAk5IA3EEPIzh2QDnzANZ4rhomvfMuyc7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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