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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c371538d47e78debdc5e46f0ff0faffaba0095e8aa8b032c75e9c2b2216cafb' 
  AND token = '3GFYMuN0zvTy7dcZRvr+1Oihq5oDnbzng5a24z9SXms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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