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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fdcaf80ce090d0ce378d85435f536f2d9bf77040bc941bc8edf44545a06be1' 
  AND token = '6fvM31R52jQV47N3z4IJg8I1ISfxeThgCItzZSvQ5e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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