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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65e92fc60e318f1d3c1ce2e8f5ff78b4002b0d1ffb9e7be4ea275f25cc9434a' 
  AND token = 'dhmT1rSuUxy1YW/lfu4mVzEHlH9FfJAk7qOpysKrCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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