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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2342d486859e4c3eda96e8e1070f349ba457c1d39d502a4cbfe3d1ac2b1c7112' 
  AND token = 'pMqdBVPLLZ8nCd4DJSY3vWWaHVqSvrQLDWuWp/+DFTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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