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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b91783e0d16e30cdeff0d0d6379fee3f378322cdb39de3ca8e4de3cd649375' 
  AND token = 'fEw13MeKy9isLpHzPYBMP5fYNUM0KPzBGNrQw2XKpjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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