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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d142b544a87732f3d4bacc22aa8e5f474d6a9a634cf2f67eb29e6576bcf8f8e' 
  AND token = 'e2mz0VL9BTLm2prmFmzCV71I/Shjd87Pkb7TEkjAXSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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