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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f22a06387bccfbfcfdc788b4b758ccd4a40f002cbadf99fed4ce67af97402d' 
  AND token = 'vL94JrTnsw2Fyud3bWg5r8V1LLGQuJAAuM8B0sQtH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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