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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97719f2175abb9b4ef5672ac53bde76de1780103a50744f7134723de271769b' 
  AND token = 'WopeznyzrvFeoVvCD+Ar2vtZBlCyCwRc77c0UYl9uak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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