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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1d196bcce36aa557e92271781b6d532387c41649e1e414a4c367a62c03d6eb' 
  AND token = '6X9+70cOjFLadTBi9MMRNptphSsJsjb19S2HVSYYBSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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