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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2e41d00f3e6921e9a19967c6f55f57550f4d63e253d737dde1a4e47a9db360' 
  AND token = 'wgNBqZlaReNFddUrHuv012s87EPQ8iWgGpuPA5TMecw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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