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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a377ff25967af1de6ea51b9e7d4af1c2f8055e894a5d0ae9d0fe3cdbd1ad8a73' 
  AND token = 'ktHW6VCGompEFL9VSwuaZ4yL3cSQ8OsEpsFOHQOnNR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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